Can I use AdMob and another ad network in the same app?
Yes — running several ad networks in one app is normal and encouraged, provided you route them through a mediation layer rather than calling each one directly. Mediation is what keeps multiple networks from fighting over the same impression: you choose one platform as the mediator (AdMob mediation, AppLovin MAX or Unity LevelPlay), add the other networks as adapters inside it, and the mediator runs the auction. Calling two ad SDKs independently for the same placement instead causes double-counted impressions, ads stacked on top of each other, and policy trouble — ads that overlap content are a Play Store violation. Two practical cautions: each adapter adds to APK size and startup time, so add networks that measurably earn rather than all of them; and keep every network's seller ID listed in your app-ads.txt file, or the added demand will not bid.
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